Motorola MVME712AM 用户手册

Support Information

3-6

34

DTR3

DATA TERMINAL READY (serial port 3) - a 
signal from the terminal to the modem 
indicating that the terminal is ready to send or 
receive data. 

35

TXD1

TRANSMIT DATA (serial port 1) - data to be 
transmitted is furnished on this line to the 
modem from the terminal. 

36

GND

GROUND 

37

RXD1

RECEIVE DATA (serial port 1) - data that is 
demodulated from the receive line is presented 
to the terminal by the modem. 

38

GND

GROUND 

39

RTS1

REQUEST TO SEND (serial port 1) - RTS is 
supplied by the terminal to the modem when it 
is required to transmit a message. With RTS off, 
the modem carrier remains off. When RTS is 
turned on, the modem immediately turns on the 
carrier. 

40,41

GND

GROUND 

42

CTS1

CLEAR TO SEND (serial port 1) - CTS is a 
function supplied to the terminal by the modem, 
and indicates that it is permissible to begin 
transmission of a message. When using a 
motmots follows the off-to-on transition of RTS 
after a time delay. 

43

GND

GROUND 

44

TXD4

TRANSMIT DATA (serial port 4) - data to be 
transmitted is furnished on this line to the 
modem from the terminal. 

45

GND

GROUND 

46

RXD4

RECEIVE DATA (serial port 4) - data that is 
demodulated from the receive line is presented 
to the terminal by the modem. 

47

GND

GROUND